Which best describes the earliest land plants?

Answer:

a. There were starch in the leaves at the end of two days in the cupboard because there was no sunlight to provide the energy for photosynthesis in the dark cupboard. Also, any previously synthesized starch in the plant leaves were used by the plant for its own metabolic requirements during the period the plant was in the cupboard. Therefore, staying in the cupboard for two days destarched the leaves.

b. The purpose of sodium hydroxide put under bell jar in D is to remove any carbon dioxide that may be present under the bell jar. This is to demonstrate that even in the presence of sunlight, carbon dioxide is required for photosynthesis to occur in plants.

Explanation:

Photosythesis is the process by which green plants manufacture their food (carbohydrates which are stored as starch) in the presence of sunlight. The site of photosynthesis in plants is the leaves.

The experimental design is to study the conditions necessary for photosynthesis to occur. For photosynthesis to occur, there must be presence of sunlight, carbon dioxide and water. Carbon dioxide and water serve as the raw materials for photosynthesis while the energy required is provided by sunlight.

The answers to the observations from the experiment are given below :

a. There were starch in the leaves at the end of two days in the cupboard because there was no sunlight to provide the energy for photosynthesis in the dark cupboard. Also, any previously synthesized starch in the plant leaves were used by the plant for its own metabolic requirements during the period the plant was in the cupboard. Therefore, staying in the cupboard for two days destarched the leaves.

b. The purpose of sodium hydroxide put under bell jar in D is to remove any carbon dioxide that may be present under the bell jar. This is to demonstrate that even in the presence of sunlight, carbon dioxide is required for photosynthesis to occur in plants.

Answer:

mitochondrion

Explanation:

the mitochondrion

Answer:

Hi, there the answer is cell theory

Explanation:

Answer:

The answer is most definitely the second option or "B". This is because, how you think you grow fingernails, or skin over a wound.

The answer is 2nd option ,full grown organisms need to replace aging and damaged cells

Answer:

You can simply define the cell wall as a semi-rigid thick protective structure that surrounds the cell membrane of some types of cells for protection and defining the shape of the cell. The cell membrane alone cannot provide the required rigidity or strength. All living organisms are composed of cells.

Answer:

9) C

13) D

Explanation:

Answer:

Could be chromatin or maybe chromosomes

Answer:

C. El sistema respiratorio.

Explicación:

El sistema respiratorio es un tipo de sistema en el que los animales toman del medio ambiente los materiales necesarios para sus actividades vitales. Los pulmones son el órgano principal del sistema respiratorio en el que el gas de oxígeno entra al cuerpo y se almacena en los pulmones a través de la inhalación. La hemoglobina que extrae el gas de dióxido de carbono de la célula lo desecha en los pulmones y carga el oxígeno necesario para el proceso de respiración. El dióxido de carbono se elimina de los pulmones mediante la exhalación.

Answer: A

Explanation:

Answer:

A, Resting in the shade

Explanation:

100% Correct, A p e x

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Answer:

B. Their cells have a nucleus.

Explanation:

Protists are eukaryotes, which means their cells have a nucleus and other membrane-bound organelles. Most, but not all, protists are single-celled.

Answer:

The answer is B their cells have a nucleus

Explanation:

I took this question on an assignment got it correct!

Answer:

3' GGACTTAA 5'

Explanation:

because Adenine always pair with Thymine and Cytosine with guanine. u can also remember them as Apple Tree and Car Garage

ph indicator is used to find the acidic or basic nature of a mixture.

there is a range of colours from red to blue

red colour indicates that solution is acidic and blue colour indicates that solution is basic

if two solutions have same colour that means they also have same ph value

Answer:

The process is called oxidative phosphorylation and it happens inside mitochondria. In the matrix of mitochondria the reactions known as the citric acid or Krebs cycle produce a chemical called NADH. NADH is then used by enzymes embedded in the mitochondrial inner membrane to generate adenosine triphosphate (ATP).

Explanation:

Answer: Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose.

Explanation:

Answer:

Most autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose. Glucose is a type of sugar. The glucose gives plants energy.

hope it helps

Answer:

The mitochondria segregate the Golgi from lateral regions of the plasma membrane, the nucleus, and the cytoplasm. The mitochondria and the golgi structures from very close contacts, and these contacts remain stable over time.

Answer:

a primary oocyte contains 46 chromosomes, while a secundary oocyte contains 23 chromosomes

Answer:

A. identical

Explanation:

because it is replicating meaning it is going to look the same and be identical.

Answer:

Some EM radiation is absorbed by the atmosphere

Explanation:

Answer:

A. Ancient bacteria

Explanation:

From the salt of the earth, researchers have isolated and revived a Bacillus strain, which they believe is >250 million years old. If correct, Russell Vreeland and his colleagues from West Chester University, Pennsylvania, have discovered the oldest living organism in the world.

Answer:

A. Ancient bacteria

Explanation:

Archae bacteria means ancient bacteria. So, option (A) is the correct answer.

Answer:

adding a catalyst will increase the rate of a chemical reaction  

Answer:

The answer is fungi.

Answer: D-amino acids are less likely to be recognized by proteolytic enzymes thereby they are not degradated.

Explanation:

Peptides are a type of polymers formed by joining several amino acids by means of peptide bonds. They are responsible for a large number of important cellular functions for the organism. Amino acids are thus the monomers that make up peptides and consist of an amino group (-NH2) at one end of the molecule and a carboxyl group (-COOH) at the other end.

Antibiotics are chemical substances produced by a living being (although they can also be synthetic derivatives made in laboratories), which kill or prevent the growth of certain kinds of sensitive microorganisms and are generally drugs used in the treatment of bacterial infections.

All amino acids, except glycine, are stereoisomers which means that there are nonoverlapping mirror images of their structure. These are labeled L (left-handed) and D (right-handed) to distinguish mirror images. A mirror image, for example, compares a right foot with a left foot. They are similar, but not exactly the same, they are like mirror images of each other. However, we could not, for example, put a right shoe on a left foot and vice versa. The same analogy applies to stereoisomers, they are similar but not superimposable, which means that not all compounds will act in the same way in an L or D molecule. For some reason, the amino acids that make up the proteins in human bodies are all L-amino acids.

To distinguish an L-amino acid from a D-amino acid, we must look at the α-carbon, which has four substituents forming a tetrahedron. then we must identify the hydrogen bonded directly to this carbon. In this way they are numbered and following the numbering order, they are classified as L or D.

Bacteria that secrete D amino acids kill other bacteria in the environment that might compete with them for resources, because they have antibiotic properties. These D amino acids are not usually recognized by proteolytic enzymes in organisms that degrade peptides or proteins. So the amino acid remains in the environment fulfilling its function, which is an antibiotic function to fight against other bacteria. Peptide toxins also fulfill this function, however, if they are destroyed by proteases.

Answer: positive sodium ions

Explanation:

This relates to the Action Potential which is what a nerve cell goes through when it needs to send information down the nerve cell to another cell and so on till it gets to the destination of the message.

The information is transmitted when the segments of the axon fire and when they do, positive sodium ions come in from outside the cell to the inside thereby making the inside positive. The previous segment would return to a resting potential when potassium ions which are negative, rush into the cell.

Answer:

b) meiosis

Explanation:

Answer:

B. Meiosis

Explanation:

Meiosis involves two DNA divisions.

Answer:

Farming can lead to the loss of natural habitats.This is destroying natural habitats and changing the very nature and look of our rural landscape.

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It is difficult to farm in an incline landscape because initial cost is high,  high operational  cost,  Limited crops can be grown. Thus,  due to these following reason,  inclined farming becomes difficult.

Vertical farming is a practice of growing crops on a hilly or incline land.

However, it may have some disadvantages like high operational cost,  high labor cost,  only a limited number of crops can be grown.

Hence,  due to  these reason, tilted farming is difficult.

Learn more about vertical farming

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Answer:

B. Meiosis

Explanation:

The meiosis produces genetically different cells.

Answer:

1977 is when people first knew about archaebacteria

Answer:

it was actually discovered in 1922

they didnt know what it actually was until 1977.

C.1977

Explanation: